TI1 OPA2317-Q1 Zero-drift, low-offset, rail-to-rail i/o operational amplifier Datasheet

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OPA317-Q1, OPA2317-Q1, OPA4317-Q1
SLOS914 – JULY 2016
OPAx317-Q1 Zerø-Drift, Low-Offset, Rail-to-Rail I/O Operational Amplifier
1 Features
3 Description
•
•
The OPA317-Q1 series of CMOS operational
amplifiers offer precision performance at a very
competitive price. These devices are members of the
Zerø-Drift family of amplifiers that use a proprietary
autocalibration technique to simultaneously provide
low offset voltage (90 μV maximum) and near-zero
drift over time and temperature at only 35 μA
(maximum) of quiescent current.
1
•
•
•
•
•
•
•
•
Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
Range
– Device HBM ESD Classification Level 3A
– Device CDM ESD Classification level C6
Supply Voltage: 1.8 V to 5.5 V
microPackages:
– Single: SOT23-5
– Dual: VSSOP-8
– Quad: TSSOP-14
Low Offset Voltage: 20 μV (Typical)
CMRR: 108-dB (Typical) PSRR
Quiescent Current: 35 μA (Maximum)
Gain Bandwidth: 300 kHz
Rail-to-Rail Input and Output
Internal EMI and RFI Filtering
The OPA317-Q1 family features rail-to-rail input and
output in addition to near flat 1/f noise, making this
amplifier ideal for many applications, and much easier
to design into a system. These devices are optimized
for low-voltage operation as low as 1.8 V (±0.9 V)
and up to 5.5 V (±2.75 V).
The OPA317-Q1 (single version) is available in the
SOT23-5 package. The OPA2317-Q1 (dual version)
is offered in the VSSOP-8 package. The OPA4317Q1 is offered in the TSSOP-14 package. All versions
are specified for operation from –40°C to +125°C.
Device Information(1)
PART NUMBER
2 Applications
•
•
•
•
•
•
•
HEV-EV power train
Advanced driver assist (ADAS)
Automatic climate control
Low noise, low power circuits
Avionics, landing gear
Medical instrumentation
Current sense
PACKAGE
BODY SIZE (NOM)
OPA317-Q1
SOT-23 (5)
1.60 mm × 2.90 mm
OPA2317-Q1
VSSOP (8)
3.00 mm × 3.00 mm
OPA4317-Q1
TSSOP (14)
4.40 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
24.00
18.00
21.00
12.00
15.00
6.00
9.00
0
3.00
-3.00
-9.00
-6.00
-15.00
-12.00
-21.00
-18.00
-24.00
Population
Distribution of Offset Voltage
Offset Voltage (mV)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
OPA317-Q1, OPA2317-Q1, OPA4317-Q1
SLOS914 – JULY 2016
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Table of Contents
1
2
3
4
5
6
7
8
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6
6
6
7
7
7
8
9
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions ......................
Thermal Information: OPA317-Q1 ............................
Thermal Information: OPA2317-Q1 ..........................
Thermal Information: OPA4317-Q1 ..........................
Electrical Characteristics: VS = 1.8 V to 5.5 V ..........
Typical Characteristics ..............................................
8.4 Device Functional Modes ....................................... 15
9
Application and Implementation ........................ 16
9.1 Application Information............................................ 16
9.2 Typical Applications ................................................ 17
9.3 System Example ..................................................... 19
10 Power Supply Recommendations ..................... 19
11 Layout................................................................... 20
11.1 Layout Guidelines ................................................. 20
11.2 Layout Example .................................................... 20
12 Device and Documentation Support ................. 21
12.1
12.2
12.3
12.4
12.5
12.6
12.7
Parameter Measurement Information ................ 12
Detailed Description ............................................ 13
8.1 Overview ................................................................ 13
8.2 Functional Block Diagram ...................................... 13
8.3 Feature Description................................................. 13
Documentation Support ........................................
Receiving Notification of Documentation Updates
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
21
21
21
21
21
21
21
13 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
2
DATE
REVISION
NOTES
July 2016
*
Initial release.
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5 Pin Configuration and Functions
OPA317-Q1: DBV Package
5-Pin SOT-23
Top View
OUT
1
V-
2
+IN
3
5
V+
4
-IN
Pin Functions: OPA317-Q1
PIN
NAME
NO.
I/O
DESCRIPTION
SOT-23
+IN
3
I
Noninverting input
–IN
4
I
Inverting input
OUT
1
O
Output
V+
5
—
Positive (highest) power supply
V–
2
—
Negative (lowest) power supply
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OPA2317-Q1: DGK Package
8-Pin VSSOP
Top View
OUT A
1
8
V+
7
OUT B
A
-IN A
2
B
+IN A
3
6
-IN B
V-
4
5
+IN B
Pin Functions: OPA2317-Q1
PIN
NAME
NO.
I/O
DESCRIPTION
VSSOP
+IN A
3
I
Noninverting input, channel A
–IN A
2
I
Inverting input, channel A
+IN B
5
I
Noninverting input, channel B
–IN B
6
I
Inverting input, channel B
OUT A
1
O
Output, channel A
OUT B
7
O
Output, channel B
V+
8
—
Positive (highest) power supply
V–
4
—
Negative (lowest) power supply
4
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OPA4317-Q1: SW Package
14-Pin TSSOP
Top View
OUT A
1
14
OUT D
-IN A
2
13
-IN D
+IN A
3
12
+IN D
V+
4
11
V-
+IN B
5
10
+IN C
-IN B
6
9
-IN C
OUT B
7
8
OUT C
Pin Functions: OPA4317-Q1
PIN
NAME
NO.
I/O
DESCRIPTION
TSSOP
+IN A
3
I
Noninverting input, channel A
–IN A
2
I
Inverting input, channel A
+IN B
5
I
Noninverting input, channel B
–IN B
6
I
Inverting input, channel B
+IN C
10
I
Noninverting input, channel C
–IN C
9
I
Inverting input, channel C
+IN D
12
I
Noninverting input, channel D
–IN D
13
I
Inverting input, channel D
OUT A
1
O
Output, channel A
OUT B
7
O
Output, channel B
OUT C
8
O
Output, channel C
OUT D
14
O
Output, channel D
V+
4
—
Positive (highest) power supply
V–
11
—
Negative (lowest) power supply
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6 Specifications
6.1 Absolute Maximum Ratings
Over operating free-air temperature range, unless otherwise noted. (1)
MIN
VS = (V+) – (V–)
Signal input terminals
(2)
TA
Operating temperature
TJ
Junction temperature
Tstg
Storage temperature
(3)
V
(V+) + 0.3
V
–10
10
mA
150
°C
150
°C
150
°C
Output short circuit (3)
(2)
UNIT
7
(V–) – 0.3
Signal input terminals (2)
(1)
MAX
Supply voltage
Continuous
–40
–65
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Input terminals are diode-clamped to the power-supply rails. Input signals that can swing more than 0.3 V beyond the supply rails must
be current-limited to 10 mA or less.
Short-circuit to ground, one amplifier per package.
6.2 ESD Ratings
VALUE
Human-body model (HBM), per AEC Q100-002 (1)
V(ESD)
(1)
Electrostatic discharge
Charged-device model (CDM), per AEC
Q100-011
UNIT
±4000
All pins
±1000
Corner pins
±1000
V
AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted).
(V+ – V–)
Supply voltage
TA
Specified temperature
6
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MIN
MAX
UNIT
1.8 (±0.9)
5.5 (±2.25)
V
–40
125
°C
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6.4 Thermal Information: OPA317-Q1
OPA317-Q1
THERMAL METRIC (1)
DBV (SOT-23)
UNIT
5 PINS
RθJA
Junction-to-ambient thermal resistance
220.8
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
97.5
°C/W
RθJB
Junction-to-board thermal resistance
61.7
°C/W
ψJT
Junction-to-top characterization parameter
7.6
°C/W
ψJB
Junction-to-board characterization parameter
61.1
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Thermal Information: OPA2317-Q1
OPA2317-Q1
THERMAL METRIC (1)
DGK (VSSOP)
UNIT
8 PINS
RθJA
Junction-to-ambient thermal resistance
180.3
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
48.1
°C/W
RθJB
Junction-to-board thermal resistance
100.9
°C/W
ψJT
Junction-to-top characterization parameter
2.4
°C/W
ψJB
Junction-to-board characterization parameter
99.3
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.6 Thermal Information: OPA4317-Q1
OPA4317-Q1
THERMAL METRIC (1)
PW (TSSOP)
UNIT
14 PINS
RθJA
Junction-to-ambient thermal resistance
120.8
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
34.3
°C/W
RθJB
Junction-to-board thermal resistance
62.8
°C/W
ψJT
Junction-to-top characterization parameter
1
°C/W
ψJB
Junction-to-board characterization parameter
56.5
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
Copyright © 2016, Texas Instruments Incorporated
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6.7 Electrical Characteristics: VS = 1.8 V to 5.5 V
At TA = 25°C, RL = 10 kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OFFSET VOLTAGE
VS = 5 V
VOS
Input offset voltage
dVOS/dT
Input offset voltage
vs temperature
TA = –40°C to +125°C
PSRR
Input offset voltage
vs power supply
TA = –40°C to +125°C, VS = 1.8 V to 5.5 V
20
±90
TA = –40°C to +125°C, VS = 5 V
±100
0.05
μV/°C
1
Long-term stability (1)
See
Channel separation, DC
μV
10
μV/V
(1)
5
μV/V
INPUT BIAS CURRENT
±275
IB
Input bias current
IOS
OPA4317-Q1
±155
TA = –40°C to +125°C
±300
pA
±400
Input offset current
OPA4317-Q1
pA
±140
NOISE
en
Input voltage noise density
Input voltage noise
in
Input current noise
f = 1 kHz
55
f = 0.01 Hz to 1 Hz
0.3
f = 0.1 Hz to 10 Hz
1.1
f = 10 Hz
100
nV/√Hz
μVPP
fA/√Hz
INPUT VOLTAGE RANGE
VCM
Common-mode voltage
CMRR
(V–) – 0.1
Common-mode rejection ratio
(V+) + 0.1
TA = –40°C to +125°C
(V–) – 0.1 V < VCM < (V+) + 0.1 V
95
108
OPA4317
TA = –40°C to +125°C
(V–) – 0.1 V < VCM < (V+) + 0.1 V, VS = 5.5 V
95
108
V
dB
INPUT CAPACITANCE
Differential
2
pF
Common-mode
4
pF
110
dB
OPEN-LOOP GAIN
AOL
TA = –40°C to +125°C, RL = 10 kΩ
(V–) + 100 mV < VO < (V+) – 100 mV
Open-loop voltage gain
100
FREQUENCY RESPONSE
GBW
Gain-bandwidth product
CL = 100 pF
300
kHz
SR
Slew rate
G=1
0.15
V/μs
Voltage output swing from rail
TA = –40°C to +125°C
OUTPUT
ISC
Short-circuit current
CL
Capacitive load drive
30
100
±5
mV
mA
See the Typical Characteristics section
Open-loop output impedance
f = 350 kHz, IO = 0
2
kΩ
POWER SUPPLY
VS
Specified voltage
IQ
Quiescent current per amplifier
TA = –40°C to +125°C, IO = 0
Turnon time
VS = 5 V
(1)
8
1.8
21
100
5.5
V
35
μA
µs
300-hour life test at 150°C demonstrated randomly distributed variation of approximately 1 μV.
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6.8 Typical Characteristics
Population
120
250
100
200
80
150
Phase
100
60
50
40
Gain
0
20
-50
0
-100
10
24.00
18.00
21.00
12.00
15.00
6.00
9.00
0
3.00
-3.00
-9.00
-6.00
-15.00
-12.00
-21.00
-18.00
-20
-24.00
Phase (°)
Open-Loop Voltage Gain (dB)
At TA = 25°C, CL = 0 pF, RL = 10 kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
100
1k
10k
100k
1M
Frequency (Hz)
Offset Voltage (mV)
Figure 2. Open-Loop Gain vs Frequency
Figure 1. Offset Voltage Production Distribution
140
120
120
100
+PSRR
PSRR (dB)
CMRR (dB)
100
80
60
-PSRR
80
60
40
40
20
20
0
0
1
10
100
1k
10k
100k
1
1M
10
100
Frequency (Hz)
Figure 3. Common-Mode Rejection Ratio vs Frequency
3
+25°C
+25°C
-40°C
-1
+125°C
+25°C
-2
1
2
3
4
5
6
7
–IB
195
190
-190
-195
+IB
-205
8
-210
9
10
Output Current (mA)
Figure 5. Output Voltage Swing vs Output Current
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200
-200
-40°C
-3
0
1M
205
-40°C
+125°C
100k
Figure 4. Power-Supply Rejection Ratio vs Frequency
Input Bias Current (pA)
Output Swing (V)
2
0
10k
210
VS = ±2.75V
VS = ±0.9V
1
1k
Frequency (Hz)
0
1
2
3
4
5
Common-Mode Voltage (V)
Figure 6. Input Bias Current vs Common-Mode Voltage
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Typical Characteristics (continued)
At TA = 25°C, CL = 0 pF, RL = 10 kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
250
VS = 5.5 V
–IB
150
100
50
VS = 5.5 V
VS = 1.8 V
0
-50
-100
+IB
-150
20
Quiescent Current (µA)
Input Bias Current (pA)
25
–IB
200
VS = 1.8 V
15
10
5
-200
+IB
-250
-50
-25
0
0
25
50
75
100
125
-50
-25
Temperature (°C)
75
100
125
Output Voltage (1 V/div)
Output Voltage (50 mV/div)
Time (5 µs/div)
RL = 10 kΩ
G=1
Figure 9. Large-Signal Step Response
2 V/div
50
Figure 8. Quiescent Current vs Temperature
Time (50 µs/div)
G=1
RL = 10 kΩ
Figure 10. Small-Signal Step Response
0
2 V/div
Input
1 V/div
Output
1 V/div
25
Temperature (°C)
Figure 7. Input Bias Current vs Temperature
Input
0
0
Output
0
Time (50 ms/div)
See Figure 18
Figure 11. Positive Overvoltage Recovery
10
0
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Time (50 ms/div)
See Figure 18
Figure 12. Negative Overvoltage Recovery
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Typical Characteristics (continued)
At TA = 25°C, CL = 0 pF, RL = 10 kΩ connected to midsupply, VCM = VOUT = midsupply, unless otherwise noted.
40
600
35
500
Overshoot (%)
Settling Time (µs)
30
400
300
200
0.001%
25
20
15
10
100
5
0.01%
0
0
1
10
10
100
100
1000
Load Capacitance (pF)
Gain (dB)
4-V Step
Figure 14. Small-Signal Overshoot vs Load Capacitance
Figure 13. Settling Time vs Closed-Loop Gain
500 nV/div
1000
Continues with no 1/f (flicker) noise.
Current Noise
100
100
Voltage Noise
10
10
1
1 s/div
Current Noise (fA/ÖHz)
Voltage Noise (nV/ÖHz)
1000
10
100
1k
10k
Frequency (Hz)
Figure 16. Current and Voltage Noise Spectral Density vs
Frequency
Figure 15. 0.1-Hz to 10-Hz Noise
50
Normal Operating Range
Input Bias Current (uA)
40
30
20
10
0
-10
-20
-30
Over-Driven Condition
Over-Driven Condition
-40
-50
-1V -800
-600 -400 -200
0
200
400
600
800
Input Differential Voltage (mV)
See the Input Differential Voltage section
Figure 17. Input Bias Current vs
Input Differential Voltage
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7 Parameter Measurement Information
10 kW
2.5 V
1 kW
Device
-2.5 V
Figure 18. Overvoltage Recovery Circuit
12
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8 Detailed Description
8.1 Overview
The OPA317-Q1 is a family of low-power, rail-to-rail input and output operational amplifiers. These devices
operate from 1.8 V to 5.5 V, are unity-gain stable, and are suitable for a wide range of general-purpose
applications. The class AB output stage is capable of driving ≤ 10-kΩ loads connected to any point between V+
and ground. The input common-mode voltage range includes both rails and allows the OPA317 series to be used
in virtually any single-supply application. Rail-to-rail input and output swing significantly increases dynamic range,
especially in low-supply applications, and makes them ideal for driving sampling analog-to-digital converters
(ADCs).
8.2 Functional Block Diagram
C2
CHOP1
GM1
CHOP2
Notch
Filter
GM2
GM3
+IN
OUT
-IN
C1
GM_FF
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8.3 Feature Description
8.3.1 Operating Voltage
The OPA317-Q1 series of operational amplifiers can be used with single or dual supplies from an operating
range of VS = 1.8 V (±0.9 V) up to 5.5 V (±2.75 V).
CAUTION
Supply voltages greater than 7 V can permanently damage the device.
See the Absolute Maximum Ratings table. Key parameters that vary over the supply voltage or temperature
range are shown in the Typical Characteristics section.
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Feature Description (continued)
8.3.2 Input Voltage
The OPA317-Q1, OPA2317-Q1, and OPA4317-Q1 input common-mode voltage range extends 0.1 V beyond the
supply rails. The OPA317-Q1 device is designed to cover the full range without the troublesome transition region
found in some other rail-to-rail amplifiers.
Typically, input bias current is about 200 pA; however, input voltages exceeding the power supplies can cause
excessive current to flow into or out of the input pins. Momentary voltages greater than the power supply can be
tolerated if the input current is limited to 10 mA. This limitation is easily accomplished with an input resistor, as
shown in Figure 19.
5V
IOVERLOAD
10 mA max
VOUT
Device
VIN
5 kW
NOTE: Current limiting resistor required if input voltage exceeds supply rails by ≥ 0.3 V.
Figure 19. Input Current Protection
8.3.3 Input Differential Voltage
The typical input bias current of the OPA317-Q1 during normal operation is approximately 200 pA. In overdriven
conditions, the bias current can increase significantly (see Figure 17).The most common cause of an overdriven
condition occurs when the operational amplifier is outside of the linear range of operation. When the output of the
operational amplifier is driven to one of the supply rails, the feedback loop requirements cannot be satisfied, and
a differential input voltage develops across the input pins. This differential input voltage results in activation of
parasitic diodes inside the front-end input chopping switches that combine with 10-kΩ electromagnetic
interference (EMI) filter resistors to create the equivalent circuit shown in Figure 20.
NOTE
The input bias current remains within specification within the linear region.
10 kW
Clamp
+IN
CORE
-IN
10 kW
Figure 20. Equivalent Input Circuit
8.3.4 Internal Offset Correction
The OPA317-Q1, OPA2317-Q1, and OPA4317-Q1 operational amplifiers use an auto-calibration technique with
a time-continuous, 125-kHz operational amplifier in the signal path. This amplifier is zero-corrected every 8 μs
using a proprietary technique. Upon power up, the amplifier requires approximately 100 μs to achieve specified
VOS accuracy. This design has no aliasing or flicker noise.
8.3.5 EMI Susceptibility and Input Filtering
Operational amplifiers vary in susceptibility to EMI. If conducted EMI enters the operational amplifier, the DC
offset observed at the amplifier output may shift from its nominal value while the EMI is present. This shift is a
result of signal rectification associated with the internal semiconductor junctions. While all operational amplifier
pin functions can be affected by EMI, the input pins are likely to be the most susceptible. The OPA317-Q1
operational amplifier family incorporates an internal input low-pass filter that reduces the amplifier response to
EMI. Both common-mode and differential mode filtering are provided by the input filter. The filter is designed for a
cutoff frequency of approximately 8 MHz (–3 dB), with a roll-off of 20 dB per decade.
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8.4 Device Functional Modes
The OPAx317-Q1 family of devices are powered on when the supply is connected. The device can be operated
as a single-supply operational amplifier or a dual-supply amplifier, depending on the application.
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www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The OPA317-Q1, OPA2317-Q1, and OPA4317-Q1 are unity-gain stable, precision operational amplifiers free
from unexpected output and phase reversal. Proprietary Zerø-Drift circuitry gives the benefit of low input offset
voltage over time and temperature, as well as lowering the 1/f noise component. As a result of the high PSRR,
these devices work well in applications that run directly from battery power without regulation. The OPA317-Q1
family is optimized for low-voltage, single-supply operation. These miniature, high-precision, low quiescent
current amplifiers offer high impedance inputs that have a common-mode range 100 mV beyond the supplies,
and a rail-to-rail output that swings within 100 mV of the supplies under normal test conditions. The OPA317-Q1
series are precision amplifiers for cost-sensitive applications.
9.1.1 Achieving Output Swing to the Op Amp Negative Rail
Some applications require output voltage swings from 0 V to a positive full-scale voltage (such as 2.5 V) with
excellent accuracy. With most single-supply operational amplifiers, problems arise when the output signal
approaches 0 V, near the lower output swing limit of a single-supply operational amplifier. A good single-supply
operational amplifier may swing close to single-supply ground, but does not reach ground. The output of the
OPA317-Q1, OPA2317-Q1, and OPA4317-Q1 can be made to swing to ground, or slightly below, on a singlesupply power source. To do so requires the use of another resistor and an additional, more negative power
supply than the operational amplifier negative supply. A pulldown resistor can be connected between the output
and the additional negative supply to pull the output down below the value that the output would otherwise
achieve, as shown in Figure 21.
V+ = 5 V
Device
VOUT
VIN
RP = 20 kW
Op Amp V- = GND
-5 V
Additional
Negative
Supply
Figure 21. For VOUT Range to Ground
The OPA317-Q1, OPA2317-Q1, and OPA4317-Q1 have an output stage that allows the output voltage to be
pulled to its negative supply rail, or slightly below, using the technique previously described. This technique only
works with some types of output stages. The OPA317-Q1, OPA2317-Q1, and OPA4317-Q1 have been
characterized to perform with this technique; the recommended resistor value is approximately 20 kΩ. This
configuration increases the current consumption by several hundreds of microamps. Accuracy is excellent down
to 0 V and as low as –2 mV. Limiting and nonlinearity occur below –2 mV, but excellent accuracy returns as the
output drives back up above –2 mV. Lowering the resistance of the pulldown resistor allows the operational
amplifier to swing even further below the negative rail. Use resistances as low as 10 kΩ to achieve excellent
accuracy down to –10 mV.
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SLOS914 – JULY 2016
9.2 Typical Applications
The circuit shown in Figure 22 is a high-side voltage-to-current (V-I) converter. It translates an input voltage of
0 V to 2 V to an output current of 0 mA to 100 mA. Figure 23 shows the measured transfer function for this
circuit. The low offset voltage and offset drift of the OPA317 facilitate excellent DC accuracy for the circuit.
V+
RS2
RS3
IRS2
470
VRS2
IRS3
4.7
10 k
R4
VRS3
C7
2200 pF
R5
A2
+
V+
200
+
Q2
330
Q1
A1
R3
VIN
+
±
1000 pF
C6
10 k
VRS1
R2
RS1
2k
IRS1
VLOAD
RLOAD
ILOAD
Copyright © 2016, Texas Instruments Incorporated
Figure 22. High-Side Voltage-to-Current (V-I) Converter
9.2.1 Design Requirements
The design requirements are as follows:
• Supply Voltage: 5-V DC
• Input: 0-V to 2-V DC
• Output: 0-mA to 100-mA DC
9.2.2 Detailed Design Procedure
The V-I transfer function of the circuit is based on the relationship between the input voltage, VIN, and the three
current-sensing resistors: RS1, RS2, and RS3. The relationship between VIN and RS1 determines the current that
flows through the first stage of the design. The current gain from the first stage to the second stage is based on
the relationship between RS2 and RS3.
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Typical Applications (continued)
For a successful design, pay close attention to the DC characteristics of the operational amplifier chosen for the
application. To meet the performance goals, this application benefits from an operational amplifier with low offset
voltage, low temperature drift, and rail-to-rail output. The OPA2317 CMOS operational amplifier is a highprecision, 5-µV offset, 0.05-μV/°C drift amplifier optimized for low-voltage, single-supply operation with an output
swing to within 50 mV of the positive rail. The OPA2317 family uses chopping techniques to provide low initial
offset voltage and near-zero drift over time and temperature. Low offset voltage and low drift reduce the offset
error in the system, making these devices appropriate for precise DC control. The rail-to-rail output stage of the
OPA2317 ensures that the output swing of the operational amplifier is able to fully control the gate of the
MOSFET devices within the supply rails.
9.2.3 Application Curve
0.1
Load
Output Current (A)
0.075
0.05
0.025
0
0
0.5
1
Input Voltage (V)
1.5
2
D001
Figure 23. Measured Transfer Function for High-Side V-I Converter
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SLOS914 – JULY 2016
9.3 System Example
RN are operational resistors used to isolate the ADS1100 from the noise of the digital I2C bus. The ADS1100
device is a 16-bit converter; therefore, a precise reference is essential for maximum accuracy. If absolute
accuracy is not required and the 5-V power supply is sufficiently stable, the REF3130 device may be omitted.
3V
+5 V
REF3130
Load
R1
4.99 kW
R2
49.9 kW
R6
71.5 kW
V
ILOAD
RSHUNT
1W
RN
56 W
Device
R3
4.99 kW
R4
48.7 kW
ADS1100
R7
1.18 kW
Stray Ground-Loop Resistance
RN
56 W
2
IC
(PGA Gain = 4)
FS = 3.0 V
Copyright © 2016, Texas Instruments Incorporated
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 24. Low-Side Current Monitor
10 Power Supply Recommendations
The OPAx317-Q1 device is specified for operation from 1.8 V to 5.5 V (±0.9 V to ±2.75 V); many specifications
apply from –40°C to +125°C. The Electrical Characteristics: VS = 1.8 V to 5.5 V table presents parameters that
can exhibit significant variance with regard to operating voltage or temperature.
CAUTION
Supply voltages larger than 7 V can permanently damage the device (see the Absolute
Maximum Ratings) table.
Place 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or highimpedance power supplies. For more detailed information on bypass capacitor placement, see the Layout
Guidelines section.
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www.ti.com
11 Layout
11.1 Layout Guidelines
Attention to good layout practice is always recommended. Keep traces short and, when possible, use a printedcircuit board (PCB) ground plane with surface-mount components placed as close to the device pins as possible.
Place a 0.1-μF capacitor closely across the supply pins. Apply these guidelines throughout the analog circuit to
improve performance and provide benefits, such as reducing the electromagnetic interference (EMI)
susceptibility.
Optimize circuit layout and mechanical conditions for lowest offset voltage and precision performance. Avoid
temperature gradients that create thermoelectric (Seebeck) effects in the thermocouple junctions formed from
connecting dissimilar conductors. These thermally-generated potentials can be made to cancel by assuring they
are equal on both input terminals. Other layout and design considerations include:
• Use low thermoelectric-coefficient conditions (avoid dissimilar metals).
• Thermally isolate components from power supplies or other heat sources.
• Shield operational amplifier and input circuitry from air currents, such as cooling fans.
Following these guidelines reduces the likelihood of junctions being at different temperatures, which can cause
thermoelectric voltage drift of 0.1 μV/°C or higher, depending on the materials used.
11.2 Layout Example
VS+
VOUT
VS±
V+
OUT
GND
V±
Use a low-ESR,
ceramic bypass
capacitor.
Use a low-ESR,
ceramic bypass
capacitor.
RG
VIN
+IN
GND
±IN
GND
Run the input traces
as far away from
the supply lines
as possible.
RF
Place components
close to the device
and to each other to
reduce parasitic
errors.
Copyright © 2016, Texas Instruments Incorporated
Figure 25. OPAx317-Q1 Layout Example
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SLOS914 – JULY 2016
12 Device and Documentation Support
12.1 Documentation Support
12.1.1 Related Documentation
For related documentation see the following:
• Self-Calibrating, 16-Bit Analog-to-Digital Converter,
• 15ppm/°C Max, 100μA, SOT23-3 Series Voltage Reference,
12.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
12.3 Related Links
lists quick access links. Categories include technical documents, support and community resources, tools and
software, and quick access to sample or buy.
Table 1. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
OPA317-Q1
Click here
Click here
Click here
Click here
Click here
OPA2317-Q1
Click here
Click here
Click here
Click here
Click here
OPA4317-Q1
Click here
Click here
Click here
Click here
Click here
12.4 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.5 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.6 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
12.7 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
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SLOS914 – JULY 2016
www.ti.com
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
www.ti.com
23-Dec-2016
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
OPA2317QDGKRQ1
PREVIEW
VSSOP
DGK
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAUAG
Level-2-260C-1 YEAR
-40 to 125
2317
OPA317QDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-3-260C-168 HR
-40 to 125
317Q
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
23-Dec-2016
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF OPA2317-Q1, OPA317-Q1 :
• Catalog: OPA2317, OPA317
NOTE: Qualified Version Definitions:
• Catalog - TI's standard catalog product
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Dec-2016
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
OPA2317QDGKRQ1
VSSOP
DGK
8
2500
330.0
12.4
5.3
3.4
1.4
8.0
12.0
Q1
OPA317QDBVRQ1
SOT-23
DBV
5
3000
178.0
9.0
3.3
3.2
1.4
4.0
8.0
Q3
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
23-Dec-2016
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
OPA2317QDGKRQ1
VSSOP
DGK
8
2500
366.0
364.0
50.0
OPA317QDBVRQ1
SOT-23
DBV
5
3000
180.0
180.0
18.0
Pack Materials-Page 2
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